diff options
| -rw-r--r-- | lib/CodeGen/SelectionDAG/InstrEmitter.cpp | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/lib/CodeGen/SelectionDAG/InstrEmitter.cpp b/lib/CodeGen/SelectionDAG/InstrEmitter.cpp index f857a1c894..e944dfd17d 100644 --- a/lib/CodeGen/SelectionDAG/InstrEmitter.cpp +++ b/lib/CodeGen/SelectionDAG/InstrEmitter.cpp @@ -296,8 +296,19 @@ InstrEmitter::AddRegisterOperand(MachineInstr *MI, SDValue Op, } } + // If this value has only one use, that use is a kill. This is a + // conservative approximation. Tied operands are never killed, so we need + // to check that. And that means we need to determine the index of the + // operand. + unsigned Idx = MI->getNumOperands(); + while (Idx > 0 && + MI->getOperand(Idx-1).isReg() && MI->getOperand(Idx-1).isImplicit()) + --Idx; + bool isTied = MI->getDesc().getOperandConstraint(Idx, TOI::TIED_TO) != -1; + bool isKill = Op.hasOneUse() && !isTied; + MI->addOperand(MachineOperand::CreateReg(VReg, isOptDef, - false/*isImp*/, false/*isKill*/, + false/*isImp*/, isKill, false/*isDead*/, false/*isUndef*/, false/*isEarlyClobber*/, 0/*SubReg*/, IsDebug)); |